Bucket base



FIG. 1 is a perspective view from above a bucket base;

FIG. 2 is a perspective view from below a bucket base;

FIG. 3 is a top view of a bucket base;

FIG. 4 is a side elevation view thereof; and,

FIG. 5 is a bottom view thereof. 

The ornamental design for a bucket base, as shown and described. 